2) \frac{8}{21}:\frac{16}{27}-\frac{3}{14}

2) \(\frac{8}{21}:\frac{16}{27}-\frac{3}{14} = \frac{8}{21} \cdot \frac{27}{16} - \frac{3}{14} = \frac{1}{7} \cdot \frac{9}{2} - \frac{3}{14} = \frac{9}{14} - \frac{3}{14} = \frac{6}{14} = \frac{3}{7}\) Ответ: \(\frac{3}{7}\)